THAT’S NOT SECURE!
You’re training your own customers to be victims of scams and fraud, potentially internal and certainly external. Any scammers can call your customers, just as you do, and ask them “verification questions,” just as you do, then do whatever they want with the answers to those verification questions.
Banks around the world have stopped this nonsense years ago....and yet you, OCBC, persist. It’s insanely insecure, for your bank, as an institution. When a reputable, well run, secure bank calls me or otherwise initiates contact with me, it’s a very short conversation: “Please call your bank at the number on the back of your card,” for example.
Every security professional that reads this message is, I’m sure, aghast at what you’re doing. It’s just absolutely bonkers insecure. Get your security team to get this stuff stopped, now. This is not 1951 any more (and it wasn’t a good idea then).